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Lithium ion battery and negative plate thereof

A lithium-ion battery and negative electrode technology, which is applied in non-aqueous electrolyte battery electrodes, secondary batteries, circuits, etc., can solve the problems of mechanical damage to the electrode, affecting production capacity, and reducing process capabilities, so as to prevent damage and alleviate the isolation film. Effects of tension, improved cycle life and safety performance

Active Publication Date: 2017-11-28
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can effectively overcome the above problems, it also has some other defects. For example, pressing the concave and convex points on the positive electrode sheet will cause mechanical damage to the electrode sheet, especially the electrode sheet with a high compaction density; it needs to be added during the winding process. Pressing rollers, increasing process control steps will reduce process capacity and affect production capacity

Method used

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  • Lithium ion battery and negative plate thereof
  • Lithium ion battery and negative plate thereof
  • Lithium ion battery and negative plate thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Preparation of positive electrode sheet

[0029] The positive electrode active material Li (Ni 1 / 3 Co 1 / 3 Mn 1 / 3 )O 2 , Conductive agent acetylene black, and binder polyvinylidene fluoride (PVDF) are mixed uniformly in a mass ratio of 97:2:1 and added to the solvent N-methyl-2-pyrrolidone (NMP) to make a positive electrode slurry; The positive electrode slurry is uniformly coated on the aluminum foil of the positive electrode current collector, dried at 85° C. and then cold-pressed, and then die-cut and slit to form a positive electrode sheet for a lithium ion battery.

[0030] Preparation of negative electrode sheet

[0031] The negative electrode active material graphite, conductive agent acetylene black, thickener sodium hydroxymethyl cellulose (CMC), and binder styrene-butadiene rubber (SBR) were added to solvent water in a mass ratio of 96:2:1:1, mixed uniformly and prepared. A negative electrode slurry is formed; the negative electrode slurry is uniformly coa...

Embodiment 2

[0044] The lithium ion battery in Example 2 of the present invention is basically the same as the lithium ion battery in Example 1 of the present invention, except that when preparing the negative electrode sheet of the lithium ion battery with bump structure, the coating density of organic particles is 0.5 mg / 1540.25 mm 2 , the average thickness of the organic particle layer is 3 μm.

Embodiment 3

[0046] The lithium ion battery in Example 3 of the present invention is basically the same as the lithium ion battery in Example 1 of the present invention, except that: when preparing the negative electrode sheet of the lithium ion battery with a bump structure, the coating density of the organic particles is 1.0 mg / 1540.25 mm 2 , the average thickness of the organic particle layer is 8 μm.

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Abstract

The invention discloses a lithium ion battery negative plate. The lithium ion battery negative plate comprises a negative current collector and negative active substance layers distributed on two surfaces of the negative current collector, wherein at least one surface of each negative active substance layer is provided with a hot-press molten protruded point structure, and the distribution density of the protruded point structure is 0.1-10mg / 1540.25mm<2>. By utilizing the protruded point structures arranged on the lithium ion battery negative plate, a buffer gap is provided between the negative plate and a diaphragm layer so as to relieve an expansion force generated during continuous expansion of the negative plate in a cycle process and an insulation membrane tension force generated during winding, so that the cycle life of a lithium ion battery can be prolonged, and the safety performance of the lithium ion battery can be improved; and by utilizing the buffer gap, a high-speed channel is provided for the infiltration of electrolyte into the negative plate, so that the standing time after liquid injection of the lithium ion battery can be shortened. Besides, the invention further discloses the lithium ion battery adopting the lithium ion battery negative plate.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and more particularly, the invention relates to a lithium ion battery with ideal cycle life and safety performance and a negative electrode sheet thereof. Background technique [0002] With the increasing exhaustion of energy, the enhancement of environmental awareness and the promotion of national policies, lithium-ion batteries have been widely used in the field of new energy due to their advantages of high energy density, no memory effect, environmental protection and no pollution. In the fiercely competitive new energy vehicle market, major companies have continuously explored and improved the performance and manufacturing process of power lithium-ion batteries, especially the cycle life and safety performance of lithium-ion batteries. [0003] In the application process of lithium-ion batteries, the expansion of the cell pole piece during cycling will directly affect the cycle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0525
CPCH01M4/13H01M10/0525Y02E60/10
Inventor 许虎史东洋林玉春金海族
Owner CONTEMPORARY AMPEREX TECH CO
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